Which of the following extrasolar planets would be easiest to detect using the Doppler shift method?
A) a massive planet far from its parent star
B) a low mass planet far from its parent star
C) a low mass planet close to its parent star
D) a massive planet close to its parent star
D
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A cyclotron is designed to accelerate protons (mass 1.67 x 10-27kg) up to a kinetic energy of 2.5 x 10-13 J. If the magnetic field in the cyclotron is 0.75 T, what is the radius of the dipole magnets in the cyclotron?
A. 14 cm B. 24 cm C. 17 cm D. 5.8 cm
Which Mars mission searched for life in the Martian soil in the 1970's?
A) Pathfinder B) Phoenix C) Viking D) Mariner
A 100-W resistance heater is connected to a 110-V dc source. What current flows through the heater?
A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A
Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?
a. 0.25T c. 0.67T b. 0.50T d. 0.71T